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Author Topic: Tesla Powerwall 2, one month in.....  (Read 3451 times)
andrewellis
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« Reply #45 on: March 13, 2019, 12:54:33 PM »

 freeze
Not too bothered about warranty, it seems like a cracking bit of kit. More concerned that if Tesla goes down, so will their servers and I will not be able to control PW2 using phone app.


https://github.com/vloschiavo/powerwall2 There is an api reverse engineered already it would appear.  It probably wouldn't take fans long to put together a replacement.
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6.48kw Solar PV JA (300W)Panels, SolarEdge inverter
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Fintray
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« Reply #46 on: March 13, 2019, 01:17:33 PM »

Also don't understand the following. 7 Sunpower panels rated 333 Whp each, = 2.331 kWhp for system. I presumed this would be attained on the sunniest day in mid summer, but I have already got to 2.3 kWhp on a couple of occasions. Don't understand. Huh

Hi Dickster

You will get less than the rated output in summer because as the panels heat up in the summer sun their output drops. You are more likely, as you have seen, that the panels will output at or slightly above their rating on days where it is cold but bright sunshine especially if there are some clouds as the panels cool when in shade but when suddenly exposed to the full sun their output will jump.
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Scruff
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« Reply #47 on: March 14, 2019, 01:32:24 AM »

The cells are rated at 20C. If you put them in a glass panel pointing at the sun they are usually 50C above atmospheric temperature. Hence their rated output is rarely ever met.

Oh but but I've seen 110% output...that's because windchill + >1000W/m input...
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dickster
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« Reply #48 on: March 15, 2019, 09:45:02 AM »

Thanks for the explanations, can't quite believe that the makers of panels don't optimise their testing results to the absolute max, but I guess there's some sort of standard they all have to follow.

Powerwall 2 misbehaving as I switch to "charge overnight from grid" settings (then internet switched off, router in spare bedroom, visitors not happy with blue flashing lights all night!), but now settled down again.
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Countrypaul
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« Reply #49 on: March 15, 2019, 11:15:54 AM »

Thanks for the explanations, can't quite believe that the makers of panels don't optimise their testing results to the absolute max, but I guess there's some sort of standard they all have to follow.

Powerwall 2 misbehaving as I switch to "charge overnight from grid" settings (then internet switched off, router in spare bedroom, visitors not happy with blue flashing lights all night!), but now settled down again.

Have you looked at your router settings? Some routers allow you to turn the LEDs off so as to prevent problems with stray light.
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dickster
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« Reply #50 on: March 15, 2019, 11:56:38 AM »

Never occurred to me, I'll have a look later on. Thanks!
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dickster
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« Reply #51 on: March 21, 2019, 09:44:19 AM »

So, with this dull weather, I'm regularly charging the Powerwall 2 on E7 overnight, judging how much I need to avoid peak time mains usage the next day, but leaving spare capacity should the sun come out.

Interestingly, and regardless of SOC, if I set it for say, a 2 hour charge, it charges fully for the first hour and then tapers the charge in 3 steps down to 0 over the next hour.

Last night I set it for 3 hours and it charged fully for the first 2, then tapered the charge to 0 over the last hour.

This seems to be a new happening, perhaps Tesla have updated the software?
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sam_cat
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« Reply #52 on: March 21, 2019, 12:42:07 PM »

Thanks for the explanations, can't quite believe that the makers of panels don't optimise their testing results to the absolute max, but I guess there's some sort of standard they all have to follow.

Powerwall 2 misbehaving as I switch to "charge overnight from grid" settings (then internet switched off, router in spare bedroom, visitors not happy with blue flashing lights all night!), but now settled down again.

Have you looked at your router settings? Some routers allow you to turn the LEDs off so as to prevent problems with stray light.


Or some black insulation tape..
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rogeriko
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« Reply #53 on: March 21, 2019, 08:05:21 PM »

The cells are rated at 20C. If you put them in a glass panel pointing at the sun they are usually 50C above atmospheric temperature. Hence their rated output is rarely ever met.

Oh but but I've seen 110% output...that's because windchill + >1000W/m input...

Solar Panels all have a NOCT output published in their documentation. That is Normal Operating Conditions and Temperature. It is considerably less than the theoretical output.
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